Added AUTHORS and LICENSE [#METR-20000].

AUTHORS

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+The following authors have created the source code of "ClickHouse"
+published and distributed by YANDEX LLC as the owner:
+
+Alexey Milovidov <[email protected]>
+Alexey Arno <[email protected]>
+Andrey Mironov <[email protected]>
+Michael Kolupaev <[email protected]>
+Pavel Kartavyy <[email protected]>
+Evgeniy Gatov <[email protected]>
+Sergey Fedorov <[email protected]>
+Vyacheslav Alipov <[email protected]>
+Vladimir Chebotarev <[email protected]>
+Dmitry Galuza <[email protected]>
+Sergey Magidovich <[email protected]>
+Anton Tikhonov <[email protected]>
+Alexey Vasiliev <[email protected]>
+Andrey Urusov <[email protected]>
+Vsevolod Orlov <[email protected]>
+Roman Peshkurov <[email protected]>
+Michael Razuvaev <[email protected]>
+Ilya Korolev <[email protected]>
+Maxim Nikulin <[email protected]>

LICENSE

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+Copyright 2016 YANDEX LLC
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.